Fastening device



FIG. 1 is a top perspective view of a fastening device showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof, the rear elevation view being a mirror image of FIG. 3;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the figures represent portions of the fastening device which form no part of the claimed design. 

CLAIM The ornamental design for a fastening device, as shown and described. 